yearn是不及物动词，常与介词for连用，也可接动词不定式作目的状语。

用作不及物动词
▲S+～(+A)
Is it not in the nature of all human beings to yearn for freedom?渴望自由不是人类的天性吗？
▲S+～+to-v
She yearned to go back to the south.她渴望回到南方去。

yearn, long, pine
参见pine条。